def plot_iso_set(AMags, EMags, **kwargs):
    ax = plt.gca()
    Acolor = AMags["WFC3_UVIS_F275W"] - AMags["WFC3_UVIS_F814W"]
    Amag = AMags["WFC3_UVIS_F814W"]
    Ecolor = EMags["WFC3_UVIS_F275W"] - EMags["WFC3_UVIS_F814W"]
    Emag = EMags["WFC3_UVIS_F814W"]
    
    ax.plot(Acolor, Amag, label="Population A", color='black', **kwargs)
    ax.plot(Ecolor, Emag, '--', label="Population E", color='black', **kwargs)